Shift 是一个集合变量。 Type
TShiftState = set of (ssShift, ssAlt, ssCtrl, ssLeft, ssRight,ssMiddle, ssDouble);
也就是说TShiftstate类型有ssShift, ssAlt, ssCtrl, ssLeft(鼠标左键),ssRight(鼠标右键), ssMiddle(鼠标中键), ssDouble (鼠标双击)
Value Meaning
ssShift The
Shift key is held down.
ssAlt The
Alt key is held down.
ssCtrl The
Ctrl key is held down.
ssLeft The
left mouse button is held down.
ssRigh......
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